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Bolts in circulator pump Strength calculation
Used bolts: 4 socket head screws M4x16 8.8
Strength class bolts: 8.8 Minimum tensile strength: 800 N/mm² Rack limit: 640 N/mm²
Maximum pressure (p) in the circulator pump: 6 bar = 6 x 105 Pa Surface (A) = r2 x π = 0,04502 x π = 0,002025 m2 Fb = p x A     = 6 x 105 x 0,04502 x π     = 3817 N FVmax= 3 x Fb  = 3 x 3817           = 11451 N Divided over 4 bolts 11451 / 4= 2863N  	=2,863 kN The tension of a M4 bolt will be around 3-5 kN (see tension table next slide) ,[object Object],(I had no information about the friction coefficient) r = 0,0450 m
Tension table (I could not find a tension table with bolts smaller than a M5, so I had to estimate the tension for a M4) M4

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Bolts circulator pump